Better for B-school: small marketing consulting firm or BB Operations (total BO) in AM division?

I would appreciate insight from anyone who has relevant knowledge/experience. Thanks!

I am graduating from college and my goal is to get into managing assets at a top firm. However, I don't think I will be able to do that right out of undergrad.

Right now I have an offer from one of the top financial institutions to work on the operations side of their AM division. Total back office gig. I also have an offer from a quantitatively focused small-mid sized consulting firm. Not a big name, but seems like they are doing very well and I would get client contact almost immediately.

Which work experience would give me the best chance of getting into a top MBA program? My GPA is excellent and I'm highly confident about the GMATS.

Also, do you think I could transition into the front office of AM post-mba with a background in either AM operations or quantitative consulting?

Thanks very much, and I appreciate any insight anyone have to offer!